Thermostatic controlling device



Jan, 1 .923. 1,441,549

- H. J C WELLS.

THERMOSTATIC CONTROLLING DEVICE.

FILED SEPT. 13, I919.

L wentor H.

Attorney Patented den, '9, T923.

HERBERTJ'. c. WELLS, or New YORK, N. Y., ASSIGNOR 'ro Mom roit GONTROLLER "COMPANY, or? BALTIMORE, MARYLAND, A conronnrron.

'rnnnmos'rn'rrc CONTROLLING nnvrcn. I

Application filed September 13, 1919. Serial K6 3283552.

To all whom it may concern-.-

Be it known that I, HERBERT J. C. WELLS, a subject of theKing of Great Britain, re-

siding at New York, 1n the county and State 5 of New York, have invented certain new and usefulImprovements in Thermostatic Controlling Devices, of which the following is a full, clear, and exactdescript'ion Specifically, the invention whichforms the subject of the present application for Letters Patent is embodied in an apparatus 7 in the nature of a thermostatic regulatorintended and designed. for controlling the rate of flow-of the cooling water or other medium in an electrical transformer, and as such it will be shown and'described. The

improvement, however, involves certain new features which'have a wider application as a thermostatic motor device "for distance control of valves and the like, which will be understood without special description by those skilled in the art.

, The apparatus which I have devised comprisesa tube filled with an expansible medium, such as oil, and a wire or conductor v of relatively high resistance with provision for connectin it up in a circuit in which the current ow bears a certain fixed re- .lation to that passing in the coils of a transformer with which it is operatively associated. The interior of the tube is in direct communication with a diaphragm tube or chamber (containing oil or other expansible liquid) in which a special form of diaphragm is contained, the, saiddiaphragm consisting preferably of a tube of sheet metal closed at its free end and connected .to the end of the containing tube or chamber at the other, and having corru' 40 gated walls, whereby any increase in the pressure of the oil or other liquid in its chamber will cause it to contract in length.

To the closed end of this diaphragm is connected a rod which passes through the head of the tube or chamber and is connected toa valve which controls the rate of flow of cooling water through'the transformer, so that when any excess of current above a fixed and predetermined limit flows through the transformer, the resistance wire is heated, and causing the oil .in its tube to expand, transmits the consequent increase of pressure to the diaphragm chamber and thereby operates to open the valve and permit an increased flow of water or.

cooling medium through the transformer.

This apparatus is shown .in the accompanying drawing in part section, thetransformer, the circuits and other parts being diagrammatically indicated.

A is the thermostatv chamber preferably for obvious reasons in the form of a tube-- with closed ends through which terminals for a resistance wire 13 extend. Connected wlth this tube and as shown, in the drawing at right angles to its middle point is the diaphragm-tube C,-the free end' of which is suitably closed by a head D to which the open end of the cylindrical corrugated diaphragm-E is connected. The other end of the diaphragm is closed by a head F to which is connected a rod G that extends thlgou 'h the diaphragm and the head of tu e preferably spring seated.

Any form of valve suitable for the purpose may be employed, and I have shown and is connected with a valve H,

one well known'in the art. The valve controls the. passage through a pipe or conduit K which carries the cooling water to a transformer L in the usual manner, not,

however, illustrated in detail herein.

The transformer L is of any usual form.

and as shown its primary coil M is connected with the feed wires'N, N, and its secondary '0 supplies current to the working circuit P. 'Connected with the latter is a series transformer R with a'primary .S and a secondary in circuit with the resistance wire B. i

The series transformer I preferably may have aratio of 1000 to one, so that with a normal flow of current under average working conditions of five amperes in the secondary this would be equivalent to 5000 amperes in the primary circuit of the series transformerx Should the load increase, the primary amperage of the series transformer increases, and, of course the secondary increase-is. in the same ratio. This will 'result in heatingto a proportionate extent the resistance wire expanding the oil and opening the valve to permit more water to flow through the transformer.

Thermostats, both electrical and mechanical, have heretofore been used to control valves to regulate the flow of water, but never, so far as I am aware, under cOndltrons winch secured the same advantages,

close interrelation between the transformer loadand the motor effect on the valve range of movement, resistance and power that result from the arrangement which "I have herein shown'and set forth.

The cylindrical corrugated diaphragm in the tube or chamber subject to the varying pressure due to variations in the temperature of the resistance wire, is exceptionally sensitive and owerful. For this reason the motor element in itself is a device of wide application and value.

What I claim is v 1. The combination with a thermostat tube filled with an eXpansible fluid and a resistance wire therein with terminals "for connecting it in a circuit, of a diaphragm nected at one end to the end of the extent-,

sion tube, and having the other end closed and carrying a vregulating rod extending through the cylindrical diaphragm "and through the end of the extension.- I

In testimony whereof I hereunto affix my H. J. o. WELLS.

signature. 

